Select all the correct answers. Which two generallzations can be made based on what you know about cycles of matter in a closed systern?
ONew matter Is added, and old matter is destroyed.
O Matter changes Its physical form, allowing it to return to lts original state.
O The amount of matter within the systern rermains the sarne.
O Matter and energy can cross the boundaries of the systern.
O The cycle has a well-defined starting and stopping point.